What is deferred revenue? Under what head it is shown in financial statement?

deferred income (the money that a company received in advance) indicates the goods and services the company owed to its customers, while accrued expense indicates the money a company owed to others.[2]money received for goods or services which have not yet been delivered. According to the revenue recognition principle, it is recorded as a liability until delivery is made, at which time it is converted into revenue.[1]

It is an amount that was received by a company in advance of earning it.The amount unearned (and therefore deferred) as of the date of the financial statements should be reported as liability..